1. Department of Mathematics, COMSATS University Islamabad, Islamabad 44000, Pakistan
2. Facultad de Economía y Empresa and Multidisciplinary Institute of Enterprise (IME), University of Salamanca, 37007 Salamanca, Spain
3. Department of Mathematics, Faculty of Science and Arts, Düzce University, Düzce 81620, Turkey
4. Department of Applied Mathematics, University Politehnica of Bucharest, 060042 Bucharest, Romania
5. Department of Electrical Engineering, College of Engineering, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia